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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
Chirped fiber Bragg grating detonation velocity sensing
G Rodriguez1, R L Sandberg, Q McCulloch
1Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. rodrigeo@lanl.gov
The Review of Scientific Instruments
|February 8, 2013
Summary
This study introduces an all-optical fiber method to precisely measure high explosive detonation front position and velocity. The technique achieves high accuracy, validated against complementary diagnostics, enabling sub-millimeter and sub-microsecond resolution for detonation studies.
Area of Science:
- Optics and Photonics
- Materials Science
- Combustion Science
Background:
- Accurate measurement of detonation front dynamics is critical for understanding high explosive behavior.
- Existing methods may have limitations in spatial-temporal resolution or invasiveness.
Purpose of the Study:
- To develop and validate an all-optical fiber-based system for measuring high explosive detonation front position and velocity.
- To demonstrate the system's capability in various explosive configurations and assess its accuracy.
Main Methods:
- Utilized an incoherent light source reflected from a linearly chirped fiber Bragg grating sensor in contact with the explosive.
- Employed dynamic mapping of total light return to track the detonation front over time.
- Performed measurements on PBX 9502 and PBX 9501 explosives in different geometries.
Main Results:
- Achieved excellent agreement with complementary diagnostics (electrical pins, streak imaging) for cylindrical rate stick measurements.
- Demonstrated high accuracy in detonation front velocity measurement, with errors below 0.3% compared to pin data.
- Showcased the system's ability to map detonation fronts in cylindrical, radial, and curved configurations.
Conclusions:
- The all-optical fiber approach provides a robust and accurate method for high explosive detonation front analysis.
- The system offers potential for sub-millimeter spatial and sub-microsecond temporal resolution.
- This technique enhances diagnostic capabilities for explosive performance and safety research.
